package com.yufei.infoExtractor.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class EncryptUtil {
	 public static void main(String[] args) {   
	        //md5加密测试   
	        String md5_1 = md5("123");   
	        String md5_2 = md5("abc");   
	        System.out.println(md5_1 + "\n" + md5_2);   
	        System.out.println("md5 length: " + md5_1.length());   
	        //sha加密测试   
	        String sha_1 = sha("123");   
	        String sha_2 = sha("abc");   
	        System.out.println(sha_1 + "\n" + sha_2);   
	        System.out.println("sha length: " + sha_1.length());   
	    }   
	  
	    // md5加密   
	    public static String md5(String inputText) {   
	        return encrypt(inputText, "md5");   
	    }   
	  
	    // sha加密   
	    public static String sha(String inputText) {   
	        return encrypt(inputText, "sha-1");   
	    }   
	  
	    /**  
	     * md5或者sha-1加密  
	     *   
	     * @param inputText  
	     *            要加密的内容  
	     * @param algorithmName  
	     *            加密算法名称：md5或者sha-1，不区分大小写  
	     * @return  
	     */  
	    private static String encrypt(String inputText, String algorithmName) {   
	        if (inputText == null || "".equals(inputText.trim())) {   
	            throw new IllegalArgumentException("请输入要加密的内容");   
	        }   
	        if (algorithmName == null || "".equals(algorithmName.trim())) {   
	            algorithmName = "md5";   
	        }   
	        String encryptText = null;   
	        try {   
	            MessageDigest m = MessageDigest.getInstance(algorithmName);   
	            m.update(inputText.getBytes("UTF8"));   
	            byte s[] = m.digest();   
	            // m.digest(inputText.getBytes("UTF8"));   
	            return hex(s);   
	        } catch (NoSuchAlgorithmException e) {   
	            e.printStackTrace();   
	        } catch (UnsupportedEncodingException e) {   
	            e.printStackTrace();   
	        }   
	        return encryptText;   
	    }   
	  
	    // 返回十六进制字符串   
	    private static String hex(byte[] arr) {   
	        StringBuffer sb = new StringBuffer();   
	        for (int i = 0; i < arr.length; ++i) {   
	            sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1,   
	                    3));   
	        }   
	        return sb.toString();   
	    }  
}